.page-articles {
  --ramp-1: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface));
  --ramp-2: color-mix(in srgb, var(--color-accent) 30%, var(--color-surface));
  --ramp-3: color-mix(in srgb, var(--color-accent) 46%, var(--color-surface));
  --ramp-4: color-mix(in srgb, var(--color-accent) 62%, var(--color-surface));
  --ramp-5: color-mix(in srgb, var(--color-accent) 80%, var(--color-surface));
  --ramp-6: var(--color-accent);
  background: var(--color-surface);
  color: var(--color-ink);
  overflow-x: clip;
}

/* ---------------- 首屏海报层 ---------------- */

.page-articles .art-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding: var(--space-6) 0 calc(var(--space-6) + var(--space-2));
}

.page-articles .art-hero::after {
  content: "";
  position: absolute;
  top: -30%;
  right: -28%;
  width: 74%;
  height: 160%;
  background: color-mix(in srgb, var(--color-primary) 24%, transparent);
  transform: rotate(-10deg);
  z-index: -1;
  pointer-events: none;
}

.page-articles .art-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background: var(--color-primary);
  clip-path: polygon(0 58%, 100% 0, 100% 100%, 0 100%);
  z-index: 3;
}

.page-articles .art-hero__inner {
  position: relative;
  z-index: 1;
}

.page-articles .art-hero__crumb {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.page-articles .art-hero__crumb a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px dotted currentColor;
}

.page-articles .art-hero__crumb a:hover,
.page-articles .art-hero__crumb a:focus-visible {
  color: var(--color-contrast-accent);
}

.page-articles .art-hero__title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.92;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-articles .art-hero__lead {
  margin: var(--space-4) 0 0;
  max-width: 60ch;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent);
}

.page-articles .art-hero__deck {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-articles .art-hero__figure {
  border-left: 1px solid var(--color-contrast-line);
  padding-left: var(--space-3);
}

.page-articles .art-hero__figure-cap {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}

.page-articles .art-hero__figure-num {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--color-contrast-accent);
}

.page-articles .art-hero__figure-note {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.page-articles .art-ramp {
  border: 1px solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
}

.page-articles .art-ramp__title {
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.page-articles .art-ramp__steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
}

.page-articles .art-ramp__step {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: var(--space-1);
  height: 104px;
}

.page-articles .art-ramp__bar {
  display: block;
  width: 100%;
  border-radius: var(--radius-sm);
}

.page-articles .art-ramp__bar--1 {
  height: 26px;
  background: color-mix(in srgb, var(--color-contrast-accent) 20%, var(--color-contrast-surface));
}

.page-articles .art-ramp__bar--2 {
  height: 36px;
  background: color-mix(in srgb, var(--color-contrast-accent) 36%, var(--color-contrast-surface));
}

.page-articles .art-ramp__bar--3 {
  height: 46px;
  background: color-mix(in srgb, var(--color-contrast-accent) 52%, var(--color-contrast-surface));
}

.page-articles .art-ramp__bar--4 {
  height: 56px;
  background: color-mix(in srgb, var(--color-contrast-accent) 68%, var(--color-contrast-surface));
}

.page-articles .art-ramp__bar--5 {
  height: 66px;
  background: color-mix(in srgb, var(--color-contrast-accent) 84%, var(--color-contrast-surface));
}

.page-articles .art-ramp__bar--6 {
  height: 76px;
  background: var(--color-contrast-accent);
}

.page-articles .art-ramp__val {
  font-size: var(--text-xs);
  text-align: center;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-articles .art-ramp__note {
  margin: var(--space-3) 0 0;
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.page-articles .art-hero__stats {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: var(--space-4) 0 0;
  border-top: 1px dotted var(--color-contrast-line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}

.page-articles .art-hero__stat {
  display: grid;
  gap: 4px;
}

.page-articles .art-hero__stat-num {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
}

.page-articles .art-hero__stat-lab {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

/* ---------------- 五条主线索引带 ---------------- */

.page-articles .art-filter {
  background: var(--color-surface-deep);
  border-bottom: 1px solid var(--color-line);
  padding: var(--space-6) 0;
}

.page-articles .art-filter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-bottom: var(--space-4);
}

.page-articles .art-filter__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-articles .art-filter__note {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-articles .art-filter__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
}

.page-articles .art-filter__link {
  display: grid;
  gap: 4px;
  height: 100%;
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--color-ink);
  transition: background 200ms ease-out, color 200ms ease-out, border-color 200ms ease-out;
}

.page-articles .art-filter__link:hover,
.page-articles .art-filter__link:focus-visible {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-articles .art-filter__idx {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-articles .art-filter__link:hover .art-filter__idx,
.page-articles .art-filter__link:focus-visible .art-filter__idx {
  color: color-mix(in srgb, var(--color-primary-ink) 78%, transparent);
}

.page-articles .art-filter__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}

.page-articles .art-filter__hint {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-articles .art-filter__link:hover .art-filter__hint,
.page-articles .art-filter__link:focus-visible .art-filter__hint {
  color: color-mix(in srgb, var(--color-primary-ink) 84%, transparent);
}

/* ---------------- 条目流 ---------------- */

.page-articles .art-stream {
  padding: var(--section-y) 0 var(--space-8);
}

.page-articles .art-stream__head {
  margin-bottom: var(--space-6);
}

.page-articles .art-stream__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-articles .art-entry {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2);
  padding: var(--space-6) 0;
  border-top: 1px dotted var(--color-line);
}

.page-articles .art-entry:nth-child(5n + 1) {
  border-top: 1px solid var(--color-ink-muted);
  padding-top: calc(var(--space-6) + var(--space-1));
}

.page-articles .art-entry:nth-child(5n + 1)::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 5px;
  background: var(--color-accent);
}

.page-articles .art-entry__idx {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink-muted);
}

.page-articles .art-entry__side {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-2);
}

.page-articles .art-entry__spec {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.page-articles .art-entry__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-articles .art-entry__sum {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .art-entry__more {
  margin-top: var(--space-3);
  border-top: 1px dotted var(--color-line);
  padding-top: var(--space-2);
}

.page-articles .art-entry__more summary {
  cursor: pointer;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-accent);
  list-style: none;
}

.page-articles .art-entry__more summary::-webkit-details-marker {
  display: none;
}

.page-articles .art-entry__more summary::before {
  content: "＋ ";
  color: var(--color-ink-muted);
}

.page-articles .art-entry__more[open] summary::before {
  content: "－ ";
}

.page-articles .art-entry__more summary:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.page-articles .art-entry__fields {
  margin: var(--space-3) 0 0;
  display: grid;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.page-articles .art-entry__fields > div {
  border-left: 1px solid var(--color-line);
  padding-left: var(--space-2);
}

.page-articles .art-entry__fields dt {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.page-articles .art-entry__fields dd {
  margin: 4px 0 0;
  color: var(--color-ink);
  line-height: var(--leading-body);
}

/* ---------------- 长卡特写带 ---------------- */

.page-articles .art-feature {
  padding: 0 0 var(--section-y);
}

.page-articles .art-feature__head {
  margin-bottom: var(--space-6);
}

.page-articles .art-feature__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

.page-articles .art-feature__card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--color-surface);
}

.page-articles .art-feature__card--narrow {
  background: var(--color-surface-alt);
}

.page-articles .art-feature__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-articles .art-feature__content {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
}

.page-articles .art-feature__meta {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

.page-articles .art-feature__title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-articles .art-feature__text {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .art-feature__pull {
  margin: 0;
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-accent);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-articles .art-feature__back {
  justify-self: start;
  margin-top: var(--space-1);
}

/* ---------------- 六档归档说明 ---------------- */

.page-articles .art-archive {
  padding: var(--section-y) 0;
  background: var(--color-surface-alt);
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
}

.page-articles .art-archive__head {
  margin-bottom: var(--space-6);
}

.page-articles .art-archive__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-articles .art-archive__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-articles .art-archive__lead {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.page-articles .art-scale {
  margin: 0;
  border-top: 1px dotted var(--color-line);
}

.page-articles .art-scale__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2px;
  padding: var(--space-3) 0;
  border-bottom: 1px dotted var(--color-line);
}

.page-articles .art-scale__row dt {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  color: var(--color-accent);
}

.page-articles .art-scale__row dd {
  margin: 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .art-archive__note {
  margin: var(--space-4) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .art-archive__note a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-articles .art-archive__note a:hover,
.page-articles .art-archive__note a:focus-visible {
  color: var(--color-focus);
}

/* ---------------- 更新节奏与归档 ---------------- */

.page-articles .art-cadence {
  padding: var(--section-y) 0;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.page-articles .art-cadence__head {
  margin-bottom: var(--space-6);
}

.page-articles .art-cadence__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.page-articles .art-cadence__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-articles .art-cadence .media-caption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.page-articles .art-cadence__steps {
  list-style: none;
  margin: 0 0 var(--space-4);
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-articles .art-cadence__step {
  border-left: 1px solid var(--color-contrast-line);
  padding-left: var(--space-3);
}

.page-articles .art-cadence__step-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.page-articles .art-cadence__step-title {
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-articles .art-cadence__step p {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.page-articles .art-cadence__step p a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-articles .art-cadence__fold {
  border-top: 1px dotted var(--color-contrast-line);
  padding: var(--space-3) 0;
}

.page-articles .art-cadence__fold summary {
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
  color: var(--color-contrast-ink);
  list-style: none;
}

.page-articles .art-cadence__fold summary::-webkit-details-marker {
  display: none;
}

.page-articles .art-cadence__fold summary::before {
  content: "＋ ";
  color: var(--color-contrast-accent);
}

.page-articles .art-cadence__fold[open] summary::before {
  content: "－ ";
}

.page-articles .art-cadence__fold summary:focus-visible {
  outline: 2px solid var(--color-contrast-accent);
  outline-offset: 3px;
}

.page-articles .art-cadence__fold p {
  margin: var(--space-2) 0 0;
  max-width: var(--measure);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
}

.page-articles .art-cadence__fold p a {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

/* ---------------- 响应式 ---------------- */

@media (min-width: 640px) {
  .page-articles .art-ramp__steps {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-articles .art-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-articles .art-entry__fields {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-articles .art-filter__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-articles .art-hero {
    padding-top: var(--space-8);
  }

  .page-articles .art-hero__deck {
    grid-template-columns: 5fr 7fr;
    align-items: end;
    gap: var(--space-6);
  }

  .page-articles .art-filter__list {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-articles .art-entry {
    grid-template-columns: 64px 190px minmax(0, 1fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-articles .art-entry__side {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
  }

  .page-articles .art-entry__title {
    font-size: var(--text-xl);
  }

  .page-articles .art-feature__grid {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-3);
    align-items: start;
  }

  .page-articles .art-archive__grid {
    grid-template-columns: 6fr 5fr;
    gap: var(--space-6);
    align-items: start;
  }

  .page-articles .art-scale__row {
    grid-template-columns: 130px minmax(0, 1fr);
    gap: var(--space-3);
    align-items: baseline;
  }

  .page-articles .art-cadence__grid {
    grid-template-columns: 6fr 5fr;
    gap: var(--space-6);
    align-items: start;
  }
}

@media (min-width: 1120px) {
  .page-articles .art-entry {
    grid-template-columns: 72px 200px minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-articles .art-filter__link {
    transition: none;
  }
}